updated po and version.
made the button sensitivity and Stop/Refresh label of remote mailbox dialog consistent.
changed safe mode option to '--safe-mode'.
remote mailbox: do not disconnect immediately but send QUIT on normal POP3 errors.
remote mailbox: Changed 'Refresh' button/menu to 'Resume'.
updated po files.
updated command line help.
updated NEWS.
made 3.4.0beta1 release.